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TABLE 2: Diagnostic Discrimination for MR Sialography and Digital Subtraction Sialography for the Three Most Frequent Diagnoses Stratified for the Investigated Gland
Performance Measure Chronic Sialadenitis Acute Sialadenitis Sialolithiasis
MRS DSS MRS DSS MRS DSS
Parotid gland 
 Sensitivity (%) 79 100 100 100 100 100
 Specificity (%) 96 100 100 100 98 100
 PPV (%) 79 100 100 100 75 100
 NPV (%) 88 100 100 100 100 100
Submandibular gland 
 Sensitivity (%) 50 88 100 100 71 86
 Specificity (%) 100 100 100 100 100 100
 PPV (%) 100 100 100 100 100 100
 NPV (%) 86 96 100 100 93 96
Note.—MRS indicates MR sialography; DSS, digital subtraction sialography; PPV, positive predictive value; NPV, negative predictive value.

Performance Measure	Chronic Sialadenitis		Acute Sialadenitis		Sialolithiasis
Performance Measure	MRS	DSS	MRS	DSS	MRS	DSS
Parotid gland
Sensitivity (%)	79	100	100	100	100	100
Specificity (%)	96	100	100	100	98	100
PPV (%)	79	100	100	100	75	100
NPV (%)	88	100	100	100	100	100
Submandibular gland
Sensitivity (%)	50	88	100	100	71	86
Specificity (%)	100	100	100	100	100	100
PPV (%)	100	100	100	100	100	100
NPV (%)	86	96	100	100	93	96